Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

I'm thinking that edit to tp_dealloc was incorrect.  The PyClear call should 
have been replaced (not removed) with the pattern shown in the C APIs docs ( 
https://docs.python.org/3/extending/newtypes.html?highlight=pyobject_clearw#weak-reference-support
 ):

    if (self->weakreflist != NULL)
        PyObject_ClearWeakRefs((PyObject *) self);

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<https://bugs.python.org/issue39778>
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